The difference between cast and convert forced type conversions in SQL Server

Source: Internet
Author: User

The difference between cast and convert forced type conversions in SQL Server

In SQL Server, both the cast and CONVERT functions are available for type conversions, and their functions are the same.

It's just a different syntax.

Cast is generally easier to use, and the advantage of convert is that dates and values can be formatted.

Code SelectCAST(‘123‘AsInt)--123
SelectCONVERT(Int,‘123‘)--123

SelectCAST(123.4AsInt)--123
SelectCONVERT(Int,123.4)--123

SelectCAST(‘123.4‘AsInt)
SelectCONVERT(Int,‘123.4‘)
--Conversion failed when converting the varchar value ' 123.4 ' to data type int.

SelectCAST(‘123.4‘AsDecimal)--123
SelectCONVERT(Decimal,‘123.4‘)--123


SelectCAST(‘123.4‘AsDecimal(9,2))--123.40
SelectCONVERT(Decimal(9,2),‘123.4‘)--123.40


Declare@NumMoney
Set@Num=1234.56
SelectCONVERT(varchar(20),@Num,0)--1234.56
SelectCONVERT(varchar(20), @Num ,  1)   -- 1,234.56
select convert< Span style= "color: #000000;" > (varchar 20),   @Num 2)   -- 1234.5600

Forcing type conversions between cast and convert in SQL Server

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